Purifier



1932- J. FORREST ET AL 1,373,953

PURIFIER Filed May 2, 1930 Patented Aug. 30, 1932 tenets UNITED STA-res ATENT QFF'ECE' JAMES FORREST, or MILWAUKEE, nun AsianRY c BaEneHLnz-oF wn's'r ALLIS, WIS- CONSIN, nssrenons To-ALLIS-QHA ERSamnuracmname COMPANY, or MIL- V WA'UKEE, WISONS IN, A CORPORATION OF DELAWARE sum e 4 Application filed May 2, 1930. f's'erial no.44a134.

The present invention relates in general to improvements in the art of separating and grading material, and relates more specifically to improvements in the construction and operation of *combined purifiers and graders for granular substances such as partially reduced grain. V

An object of the invention is to provide new and useful improvements in granular 'material purifying and separating devices, whereby the efliciency of such devices is enhanced to a maximum. p Another object of the invention'isto provide a purifier having a casing provided with an inlet for material to be purified in an end portion thereof, a movable screen ex tending lengthwise in said casing, a movable series of troughs mounted over said' screen adjacent the end of said casing opposite said inlet said caslng 'provldmg a space above said screen of increasing area extending from a point adjacent said inlet toward the casing sieve, and with means for delivering material to and from the screen, and for removing the lighter substances withthe' aid of an air current. While the prior devices 'of this character are quite satisfactory insofar as grading of the material passing through the screen is concerned, they are relatively inefficient for properly grading the oversize product which fails to penetrate the screen openings, and for removing the fine dust and c afi, :yg:

cally.

' The improved It is a more specific object invention to provide a purifier'which will more effectively free the material treated,

from impurities, and which will also more accurately grade the purified product, than has heretofore been possible.

A clear conception of one embodiment of the inventionand of the mode'of operating devices built in'accordance' therewith, may be hadb'y referring to thedrawingaccompanying and forming a part of this specification in which like reference characters designate thesame or similar parts in theseveral views.

FigL is a longitudinal vertical section through-an improved purifier, showing the driving 1 'echan1sm thereof diagrammati- Fi L2 isa part sectional end view of the purifier, looking toward the discharge end of the apparatus.

trated in the drawing comprises/in 'generala reciproc'able sieve or screen 4; means fordeliverlng material'upon one endv of the screen;

means for grading and discharging material passing through the'screen and means for inducinga flow of air through all portions of the screen, The screen i is disposed within a housing 34 and is'movably supported by a series of suspension links 7. The screen is, longitudinally reclprocable by means of an eccentric '10 operable by driving mechanism 11. One or more elongated brushes 5 are movable transversely across the bottom of the screen 4 by means of conveyer chains 27 which. are 'also operable by .the driving mechanism The material to'be graded is supplied to a hopper 12 through a spout 29." The lower discharge end of the hopper 12is provided with aife'ed roll 14 with which a laterally movablewall 13 of the hopper is cooperable in order to control thefquantity of material 4 delivered to the screen. Located beneath the hopper12 and feed roll 14, is apreliminary' purifier specifically 'illu sv of the present I separating chamber to which controllable quantities of air may be admitted pastadjustable shutters 33, and the lower portion of the chamber 15 is provided with a delivery opening directed toward the receiving end of the screen 4. The chamber 15 is bounded on the right as viewed in Fig. 1 by a wall the upper portion of which is spaced from the adjacent wall of the hopper 12, so as to provide a passage. connecting. the preliminary separating chamber 15 with. the "secondary separating chamber 16. The chamber 16 is located directly above a screw conveyer 18 "which is 1 adapted to discharge particles de- *p-osited inthe path thereof, fronrt-he purifier through a delivery spout 31, see Fig; 2. The upper end of the secondary settling chamber 16 is communi cable with a suction passage'35 past an adjustable valve 17, and thesuction passage communicatesdirectly with a suc tionfan orother suction producing-means through the piping 2. .?Disposed;,zabovethe dischargegend ofthe screen; 4:: remote from the; materialreceiving 7 end thereofiis a group of \l-shapedtrou-g-hs 8 which are support-ed upon a'frame .3; and are spacedapartlaterally. The frame3- is movends of the troughs 8-communicate withwa aspout 21- for deliveringcmater alz-zreceivd by :gravity'from within the troughs 8,, fromzthe purifier.

1' Disposed 'beneaththe screen tis a separatring chamber '23 towhich air may be admit- V 4 ted through adjustable shutter mechanism-19 located at thefeed endrof the purifier orpast vertically: adjustable slides '32 locatedwat'xthe soppositesides of the wmachine, "or through "zlower openingscontrollable by' means of 'adjl-usta'ble plates 22. The d sposition of-theair inlet openings shouldpreferablyxbe such that 'a substanti ally uniform flow of air is produced: upwardly through the-entire 1 screen .4,

:1 the flow :ofxair being induced: :by thesuction 'Wlt'hll'll the piping 2: and I the velocity of, the

V :wflow being controllable by means of'anwadalso bewprovi-ded with windows 28 at-the op- -j-u'stable :a-ir'control: 26. They machine :may

posite sides thereof for the purpose of observing the' 'operation of the separating mechanism. ce

Located beneath :the separating chamber'23 is a'set screw conveyers'24e to either of-which-materialmay be delivered by swinging theadjustable plates '22 in'"the proper-direction The conveyer screws '24:.55116 provided :with 'di scharge spouts 25; and the "delivery end of the screen' 4 likewiseacommunicates with a discharge spout 20 for conducting the oversize material from the top of the screen away from the purifier.

During normal operation of the purifier, the material to be treated is delivered from the spout 29 to'the hopper 12 and is discharged from the hopper 12 over the feed roll 14: in the form of a continuous fiat stream. As the sheet of entering material gravitates through thechamber 15, the lighterparticles .are removcdbyair entering the-chamber 15 past the shutters 33, and are carried into the secondary chamber 16. In the chamber 16 the velocity er the air current is suddenly somewhat diminished, and relatively heavy particles"immediately settle by gravity into thepath of the conveyer screw 18 and are "removed. The finer dust and chaff is with .drawn through .thepassage 35 and the pipin 21 I i materialr whi ch reaches. the .bottom of the chainber 15-is-delivered1upon the receiv- =ing-fencl---of the screen 4 through the opening 3.0, and His advanced longitudinally of. the

.screen by -virtue, of the constant reciproca-.

. tion-iand slighti'inclination thereof. As the material advances along the screen i, the air admitted;pasttheshutters 19, slides 32,: and plates;-22,-passesupwardly through the. chamber 23. and; through the screen l and' this cure rent of air removes otherafine. partlcles of dust and chaff and carries the same pastthe --.air control 26 to-ithe ipiping2, The brush 5 ;is-- bcing-;periodically brought into engage- -.-men't With-the under sideofthescreen 4 and npreven-ts; pieces of.- material from rlodgingin a andclog ingthe ;openings of the screen.

simultaneously with this movement of the screen: 4:130; advance material longitudinally 'ther.eof,-thestreng hs-supporting frame .3 is *being reciprocated in; the opposite-direction, -athereby tending to -counterbalance vibrations result-ing from the-rapid reciprocation of the xscreen lltlwlllabe apparent that the air ncurr'ent'passing' upwardly throughthe screen Joeyond.the'auppenedges of the troughs 8, the

': ve1'oc'ity.:a thereof; is again suddenly a reduced, rand thehe'avier particles being'carried by the air, 'drop' by gravity into the; troughs 8 and r are eventually: deliv eredfrom the low-er ends .ao'f'thesen troughs to the spout 21iby virtue of therlongitudinalreciprocation and inclinahti'on aof; theitrOughsB. =The particles of dust and chaff passing off from the receiving end of the screen are carried along the space above screen l of increasing area to points above the troughs 8 whereby reason of the increased area of said space the velocity of the carrying gaseous fluid is sufficiently reduced to per mit of settling of such dust and chaff onto the troughs 8 and thereby further enhancing the purifying eficiency of the device.

The material which passes through the screen i gravitates through the chamber 23 and is ultimately delivered from the machine by V the conveyers 24 through the discharge spouts 25. This material may be readily graded by proper adjustment of the plates 22. By setting the plates 2:2 near the feed end of the machine in one direction with respect to the longitudinal central plane of the machine, and those at the discharge end of the machine in the opposite direction with respect to said plane, any desired degree of grading of the.

material delivered through the screen 4:, may be secured. The oversize material which fails to pass through the screen 4 and to be otherwise removed therefrom, is delivered over the discharge end of the screen i and from the machine through the spout 20.

From the foregoing description it will'be apparent that the reciprocable troughs 8, by virtue of their reciprocation in a direction opposite to that ofthe screen 4:, tend to counterbalance vibrations set up by the reciprocating screen. The troughs 8 should be disposed at a proper height above the screen 4 so as to produce the desired results, and these troughs may be readily constructed of sheet metal bent into V-shape and having a trian ular strip of wood located in the bottom through the windows 28.

ofzach trough. The troughs 8 will effectively remove a grade of material which could not heretofore be removed, and the entire operation of the machine can readily be observed The valve 17 and control device 26, as Well as the adjustable shutters 33, 19, the slides 32, and the plates permit accurate control of the machine and also enable uniform distribution of the air current, so as to produce any desired degree of grading of the material. The suction induced within the piping 2 serves to effec-' tively remove dust and chaff, and thereby thoroughly purifies the product.

It should be understood that it is not desired to limit the invention to the exact details of construction and to the precise mode of operation herein shown and described, for various modifications within the scope of the claims may occur to persons skilled in the art.

It is claimed and desired to secure by Letters Patent:

1. In a purifier, a casing having an inlet for material to be purified in an end portion thereof, a movable screen mounted in said casing, a movable series of troughs mounted over said screen adjacent the casing end remote from said inlet, said casing having a space above said screen that is isolated from tending lengthwise in said casing, a reciprocable battle and collecting means mounted over said separatlng means ad acent the easing end remote from said inlet, means forv simultaneously reciprocating said separating andsaid bafiie means, sa1d casing having a space above said separating means that is isolated from said inlet and of increasing area extending from a point adjacent said inlet toward the casing end opposite said in- 7 let, and means for producing a flow of gaseous fluid through said separating means and a flow past said inlet, said means communicating with said inlet and communicating with said space at a point in said casing remote from said inlet.

In testimony whereof, the signatures of the inventors are afiixed hereto.

JAMES FORREST.

ASBUBY C. BRENGHLEY. 

